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GOODWILL AND OTHER INTANGIBLE ASSETS - Additional information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Goodwill [Line Items]            
Goodwill $ 498,377   $ 498,377     $ 466,638
Acquisition of other businesses     57,459      
Goodwill impairment     26,681      
Other     961      
Amortization expense 8,446 $ 10,191 26,665 $ 30,478    
Estimated future amortization expense remainder of fiscal year 8,677   8,677      
Estimated future amortization expense year one 31,672   31,672      
Estimated future amortization expense year two 28,922   28,922      
Estimated future amortization expense year three 26,694   26,694      
Estimated future amortization expense year four 23,188   23,188      
Estimated future amortization expense after year four 47,932   47,932      
Impairment of goodwill and tradenames $ 0 $ 35,500 $ 27,681 $ 37,233    
Goodwill, fair value disclosure         $ 0  
Measurement Input, Growth Rate            
Goodwill [Line Items]            
Reporting unit, measurement input 0.04   0.04      
Measurement Input, Discount Rate            
Goodwill [Line Items]            
Reporting unit, measurement input 0.16   0.16      
Measurement Input, Royalty Rate            
Goodwill [Line Items]            
Reporting unit, measurement input 0.02   0.02      
Tradenames            
Goodwill [Line Items]            
Impairment of intangible assets (excluding goodwill)     $ 1,000      
Indefinite-lived intangible assets (excluding goodwill), fair value disclosure         $ 18,500  
All Other            
Goodwill [Line Items]            
Goodwill $ 60,944   60,944     3,280
Acquisition of other businesses     56,028      
Goodwill impairment     0      
Other     1,636      
Operating Segments | Financial Consulting Segment            
Goodwill [Line Items]            
Goodwill 30,885   30,885     29,597
Acquisition of other businesses     1,431      
Goodwill impairment     0      
Other     (143)      
Operating Segments | Capital Markets Segment            
Goodwill [Line Items]            
Goodwill $ 161,486   161,486     $ 162,018
Acquisition of other businesses     0      
Goodwill impairment     0      
Other     $ (532)